Line wrapping changes

[Neil Hodgson]

There are some inefficiencies in the line wrapping code with lines outside the wrap-needed range being wrapped and lines being wrapped multiple times. Some improvements were just committed that should optimise the more common cases. In particular, most typing or deletion within a line should only cause that line to be rewrapped.

A bug was introduced earlier this year that led to lines being wrapped shorter than they should and this has been fixed.

The change sets are
http://sourceforge.net/p/scintilla/code/ci/9df53cc033e271f72fa37095a3f23f8aa3fa8006/
http://sourceforge.net/p/scintilla/code/ci/3e8191a68112e2b2cfbd7c5f5d2fab42fa70858c/
http://sourceforge.net/p/scintilla/code/ci/7bd094bcb7bada19de54aec108b50ba25e03d395/

Its possible that there are new bugs in these changes so watch out for painting and wrapping problems.

Neil